If you can setup the hosting server with auth additionaly DomainA, it may be possible. There is nothing can be done in FM setting side.
Sorry I have no experience.
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We use external authentication with user accounts (Windows Active Directory) that are in Domain A behind a Firewall with FileMaker Server that is hosted on a server in Domain B.
However, Domains A&B have a trust relationship that allows Domain B to see the AD groups in Domain A.
Of course the appropriate firewall ports for Windows networking need to be open to allow this.